Radio device

ABSTRACT

A subject of the present invention is to provide a radio device which is capable of improving a deterioration of an antenna gain caused due to a spring portion in an external memory connector. 
     A conductive member ( 17 ) for grounding a spring portion ( 16 ) in an external memory connector ( 13 ) to a circuit board ( 11 ) is provided. Alternately, pawls ( 23 ) connected electrically to the spring portion ( 16 ) are provided to a conductive chassis ( 21 ) to ground the spring portion ( 16 ). As a result, the resonance of the spring portion ( 16 ) is not caused and thus a deterioration of an antenna gain caused due to the resonance is improved.

TECHNICAL FIELD

The present invention relates to a radio device such as a mobileterminal, or the like and, more particularly, a radio device having anexternal memory connector to which an external memory can be fitted.

BACKGROUND ART

The user of the recent mobile terminal has a great abundance ofoccasions to handle the data, for example, to save image data of acamera, save music data being downloaded from a site on a network, pickout the saved image data or music data by using an external memory thatis detachably attached to the equipment main body, and the like.

In the external memory connector provided to the mobile terminal that isenabled to use the external memory, a card guiding mechanism for guidingthe external memory is provided. This card guiding mechanism has a slidemember, and a spring portion that urges the slide member in thedirection opposite to the insertion direction of the external memory(see Patent Literature 1, for example).

FIG. 8 is a general view of an external memory connector in the priorart, and FIG. 9 is a general view of an inside of the same externalmemory connector. In FIG. 8 and FIG. 9, an external memory connector 50contains a conductive chassis 51, an insulating housing 52, a pluralityof terminals 53, a conductive spring portion 54, and a card detectingswitch 55.

A plurality of terminals 53, the spring portion 54, and the carddetecting switch 55 are contained in the housing 52. The spring portion54 is provided to urge the slide member (not shown) in the directionopposite to the insertion direction of the external memory, as describedabove. The card detecting switch 55 detects the insertion of theexternal memory into the housing 52, and is constructed by two metalpieces 55 a, 55 b. The metal pieces 55 a, 55 b is brought into a closedstate when the external memory is inserted into the housing 52, and isbrought into an open state when the external memory is removed from thehousing 52.

-   Patent Literature 1: JP-A-2007-027030

DISCLOSURE OF THE INVENTION Problems that the Invention is to Solve

By the way, in the radio device such as the mobile terminal, or thelike, which is equipped with the external memory connector, such aproblem exists that an antenna gain is deteriorated due to the resonanceof a spring portion in the external memory connector.

The present invention has been made in view of such circumstances, andaims to provide a radio device capable of improving a deterioration ofan antenna gain caused due to a conductive spring portion in an externalmemory connector.

Means for Solving the Problems

A radio device of the present invention, includes a circuit board; anantenna connected to the circuit board; an external memory connectorconnected to the circuit board; a conductive spring portion provided tothe external memory connector to expand/contract in an insertiondirection of an external memory; and a conductive member for groundingthe spring portion to the circuit board.

According to the above configuration, the conductive spring portion inthe external memory connector is grounded to the circuit board via theconductive member. Therefore, the resonance is not caused due to thetransmitted radio wave, and thus a deterioration of the antenna gain canbe improved.

Also, in the above radio device, a lumped-constant element is providedbetween the spring portion and the circuit board.

According to the above configuration, the lumped-constant element isemployed. Therefore, the spring portion can be grounded in an idealphase as the antenna

Also, a radio device of the present invention, includes a circuit board;an antenna connected to the circuit board; an external memory connectorconnected to the circuit board; a conductive spring portion provided tothe external memory connector to expand/contract in an insertiondirection of an external memory; and a conductive chassis provided tosurround the circuit board, the antenna, the external memory connector,and the conductive spring portion, and grounded to the circuit board;wherein pawls that are connected electrically to the conductive springportion are provided to the conductive chassis.

According to the above configuration, the spring portion in the externalmemory connector is grounded to the circuit board via the pawls of theconductive chassis. Therefore, the resonance is not caused due to thetransmitted radio wave, and thus a deterioration of the antenna gain canbe improved.

Also, a radio device of the present invention, includes a circuit board;an antenna connected to the circuit board; an external memory connectorconnected to the circuit board; a conductive spring portion provided tothe external memory connector to expand/contract in an insertiondirection of an external memory; and a conductive chassis provided tosurround the circuit board, the antenna, the external memory connector,and the conductive spring portion, and grounded to the circuit board;wherein a conductive member that is connected electrically to theconductive spring portion is provided to the conductive chassis.

According to the above configuration, the spring portion in the externalmemory connector is grounded to the circuit board via the conductivemember of the conductive chassis. Therefore, the resonance is not causeddue to the transmitted radio wave, and thus a deterioration of theantenna gain can be improved.

Advantage of the Invention

The radio device of the present invention can improve a deterioration ofan antenna gain caused due to the conductive spring portion in theexternal memory connector.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 A perspective view showing a schematic configuration of a radiodevice according to Embodiment 1 of the present invention.

FIG. 2 A general view of an inside of an external memory connector inFIG. 1.

FIG. 3 A general view of a back surface side of the external memoryconnector in FIG. 1.

FIG. 4 A general view of an inside showing a case where alumped-constant element is provided to the external memory connector inFIG. 1.

FIG. 5 A general view of an external memory connector of a radio deviceaccording to Embodiment 2 of the present invention.

FIG. 6 A general view of a back surface side of a chassis of theexternal memory connector in FIG. 4.

FIG. 7 A general view of a back surface side showing a case where aconductive member is provided to the chassis of the external memoryconnector in FIG. 4.

FIG. 8 A general view of an external memory connector in the prior art.

FIG. 9 A general view of an inside of the external memory connector inthe prior art.

DESCRIPTION OF REFERENCE NUMERALS

-   -   11 circuit board    -   12 planar inverted F-type antenna    -   13, 20 external memory connector    -   14 housing    -   15 terminal    -   16 spring portion    -   17 conductive member    -   18 card detecting switch    -   19, 22 hole    -   21 chassis    -   23 pawl    -   24 lumped-constant element    -   25 conductive member    -   30 card type memory

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments for carrying out the present invention will beexplained in detail with reference to the drawings hereinafter.

Embodiment 1

FIG. 1 is a perspective view showing a schematic configuration of aradio device according to Embodiment 1 of the present invention. In FIG.1, the radio device according to the present embodiment includes acircuit board 11, a planar inverted F-type antenna 12 connected to thecircuit board 11, and an external memory connector 13 connected to thecircuit board 11. Here, various circuits such as atransmitting/receiving circuit, a sound processing circuit, etc., whichare needed to function as the radio device, are installed into thecircuit board 11. But their illustration will be omitted herein becausethese circuits are not directly relevant to the present invention.

FIG. 2 is a general view of an inside of the external memory connector13. Also, FIG. 3 is a general view of a back surface side of theexternal memory connector 13. In FIG. 2, the external memory connector13 contains an insulating housing 14, a plurality of terminals 15, aconductive spring portion 16, a conductive member 17 for grounding thespring portion 16 to the circuit board 11, and a card detecting switch18.

A plurality of terminals 15, the conductive spring portion 16, theconductive member 17, and the card detecting switch 18 are contained inthe housing 14. The spring portion 16 is provided to urge a slide member(not shown) in the direction opposite to the insertion direction of acard type memory 30. The card detecting switch 18 detects the insertionof the card type memory 30 into the housing 14, and is constructed bytwo metal pieces 18 a, 18 b. The metal pieces 18 a, 18 b are broughtinto a closed state when the card type memory 30 is inserted into thehousing 14, and are brought into an open state when the card type memory30 is pulled out from the housing 14.

Also, as shown in FIG. 3, a hole 19 through which a part of the springportion 16 (a portion that is positioned on the back side of the housing14) is seen is provided in the housing 14. The conductive member 17 isformed into a shape that is fitted into this hole 19. When theconductive member 17 is fitted into the hole 19, the conductive member17 is brought into contact with the spring portion 16 and also isgrounded to the circuit board 11. Since the spring portion 16 isgrounded, the resonance of the spring portion 16 is not caused and thusa deterioration of the antenna gain caused due to the resonance isimproved.

Here, as shown in FIG. 4, a lumped-constant element 24 such as areactance element, a capacitance element, or the like as well as theconductive member 17 may be employed, and the spring portion 16 may begrounded via the lumped-constant element 24. In this case, when a valueof the lumped-constant element 24 is decided to meet a desiredfrequency, the spring portion 16 can be grounded in an ideal phase asthe antenna.

In this manner, in the radio device, the conductive member 17 forgrounding the spring portion 16 in the external memory connector 13 tothe circuit board 11 is provided. As a result, the resonance of thespring portion 16 is not caused and thus a deterioration of the antennagain caused due to the resonance is improved.

Embodiment 2

FIG. 5 is a general view of an external memory connector of a radiodevice according to Embodiment 2 of the present invention. Also, FIG. 6is a general view of a back surface side of a chassis of the externalmemory connector. Here, except that a feature of the present embodimentresides in a chassis of the external memory connector, the radio deviceof the present embodiment has the similar configuration and structure tothose of the radio device of Embodiment 1. Therefore, explanation willbe made by affixing the same reference numerals to the common portions.

As shown in FIG. 5 and FIG. 6, an external memory connector 20 has aconductive chassis 21. In the conductive chassis 21, a hole 22 isprovided by forming two foldable pawls 23 in the position where a partof the spring portion 16 (a portion that is positioned on the back sideof the housing 14) is seen. Two pawls 23 are formed to form a rightangle to the housing 14. Also, an interval between two pawls 23, i.e., asize of the hole 22, is set slightly smaller than a diameter of thespring portion 16 such that respective pawls 23 can grasp the springportion 16. Since the conductive chassis 21 is grounded to the circuitboard 11, the spring portion 16 is grounded to the circuit board 11 viathe chassis 21 when two pawls 23 grasp the spring portion 16.

The spring portion 16 is grounded by two pawls 23 that are formed in theconductive chassis 21. Therefore, the resonance of the spring portion 16is not caused and thus a deterioration of the antenna gain caused due tothe resonance is improved.

In this case, as shown in FIG. 7, except a formation of the pawls 23, aconductive member 25 such as a conductive cushion that is connectedelectrically to the spring portion 16, or the like may be provided tothe conductive chassis 21.

In this manner, in the radio device of the present embodiment, the pawls23 that are connected electrically to the conductive spring portion 16are provided to the conductive chassis 21 such that the spring portion16 may be grounded. As a result, the resonance of the spring portion 16is not caused and thus a deterioration of the antenna gain caused due tothe resonance is improved.

The present invention is explained in detail with reference to theparticular embodiments as above. But it is obvious for those skilled inthe art that various variations and modifications can be applied withoutdeparting from a spirit and a scope of the present invention.

INDUSTRIAL APPLICABILITY

The present invention possesses such an advantage that a deteriorationof the antenna gain caused due to the spring portion in the externalmemory connector can be improved, and is applicable to all radio devicessuch as the mobile terminal, and the like, which are used to hold aradio communication.

1. A radio device, comprising: a circuit board; an antenna connected tothe circuit board; an external memory connector connected to the circuitboard; a conductive spring portion provided to the external memoryconnector to expand/contract in an insertion direction of an externalmemory; and a conductive member for grounding the spring portion to thecircuit board.
 2. A radio device according to claim 1, wherein alumped-constant element is provided between the spring portion and thecircuit board.
 3. A radio device, comprising: a circuit board; anantenna connected to the circuit board; an external memory connectorconnected to the circuit board; a conductive spring portion provided tothe external memory connector to expand/contract in an insertiondirection of an external memory; and a conductive chassis provided tosurround the circuit board, the antenna, the external memory connector,and the conductive spring portion, and grounded to the circuit board;wherein pawls that are connected electrically to the conductive springportion are provided to the conductive chassis.
 4. A radio device,comprising: a circuit board; an antenna connected to the circuit board;an external memory connector connected to the circuit board; aconductive spring portion provided to the external memory connector toexpand/contract in an insertion direction of an external memory; and aconductive chassis provided to surround the circuit board, the antenna,the external memory connector, and the conductive spring portion, andgrounded to the circuit board; wherein a conductive member that isconnected electrically to the conductive spring portion is provided tothe conductive chassis.